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Private investigator Michael Shayne (Lloyd Nolan) is just about to marry his sweetheart, singer Joanne La Marr (Mary Beth Hughes). On their wedding day he meets up with Joanne at the Hotel du Nord where she is staying, but as they are about to leave together, Michael hears a woman screaming from one of the rooms.

It turns out that the hotel maid Emily (Virginia Brissac) has discovered two dead people: producer Louis Lathrop, owner of the hotel and the adjoining theater, and Desiree Vance, one of Lathrop's actresses. Both are dressed up in medieval costumes. Lathrop also has the head from a dog costume on him.

Police Investigator Pierson (William Demarest) arrives at the scene and learns from the hotel manager, Hal Brennon (Charles Amt), that the costumes seem to be from Lathrop's only successful show, Sweethearts of Paris, from many years before. On the cast of the show was Desiree as the leading lady, and Carlo Ralph (Erwin Kalser) as Beppo the Dog. Immediately Shayne suspects Carlo of being the killer, since there is a symbolism in placing the dog costume head on Lathrop.

On the cast of that show were also actors David Earle (Charles Trowbridge) and Julian Davis (Henry Daniell). Earle comes to the hotel and tells the police that Lathrop had hosted a private party for the entire cast of the show to celebrate its anniversary. Shayne examines the list of people involved in the show production and discovers that the musical director was Max Allaron (Milton Parsons), an alcoholic who also lives at the hotel.

As the investigation proceeds, Shayne learns that Lathrop had another woman besides Desiree, and that the apartment has many entrances and exits. From Earle's daughter he also learns that Davis stole money from Lathrop, and he decides to pay Davis a visit. Shayne finds Davis with Phyllis Lathrop, Louis' wife. They confess to embezzling money from Louis, but claim to be innocent of his murder. They hire Shayne to help them prove their innocence.

Shayne continues his investigation and talks to Max Allaron. He learns that Carlo died in the First World War in France. In Desiree's room, Shayne finds a metal box containing a letter from Carlo written after the war in 1920, where he claims to have returned to the U.S after being held hostage for months. Clearly he has survived the war.

Shayne brings Davis to the Lathrop apartment and they discover a hidden passage to the maid Emily's room downstairs. When they enter Emily's apartment, they find her dead body and a note explaining that she was the one who killed Lathrop because he betrayed her years before for another woman. It also turns out Emily was once known as actress Lynn Evans.

However, Shayne does not believe that Emily has killed herself, so he continues searching for the real killer. When Shayne is back in Lathrop's apartment, Investigator Pierson is knocked out in the next room by Allaron. Shayne rushes to see what happened and Otto Kahn, the theatre doorman, arrives and confesses that he is the one who killed Lathrop and Desiree. He is really Carlo, and was married to Desiree before she left him for Lathrop. He also killed Emily since she found out too much about him. Allaron has been blackmailing Carlo since he saw him leave the apartment right after the killings.

While they are talking, Pierson comes back to life and together with Shayne he overpowers Otto and Allaron. Shayne appoints Pierson to be best man at the wedding later in the day, but when Shayne arrives to Joanne's apartment, she has eloped with her ex-boyfriend because she has grown tired of waiting for him.[1]

When the film was released on DVD in 2005, DVD Beaver called the film "one of the most enjoyable 'B' movies I've ever seen." Hal Erickson writing forAllmovie writes the film "benefits from a powerhouse supporting cast and the effectively moody cinematography of Glenn MacWilliams."